I am growing in a 5 gal DWC. I am having some leaves starting to yellow a bit and am thinking its the beginning of Nitrogen def. EC, PH and temps all look good so i know its N deficiency. How do i add more N to my res? I am using the fox farms trio for hydro. The Tiger Bloom is 2-8-4 and Grow Big 3-2-6. Do i need another nutrient a little higher in N? Any recomendations appreciated Gracias